I have a different opinion (as usual). I love muzzleloaders, but to me, they are a throwback to bygone days, and when I shoot them, I can't enjoy them unless I do it the way it was done then. To me, that means a patched round ball. Actual bullets came along way after the muzzleloaders we replicate and shoot.
And another thing: The patched round ball will take any game we hunt on this continent. A .54 ball is plenty for whatever. But the conicals and the sabots and the Powerbelts do it better, right? Yep, you get more range and more knockdown. But if you want that, you might as well have an inline, IMO. I like the limitations of the patched roundball, the authenticity of it, the realness that takes me back in my illogical brain to the good ol days.
I hate to admit that I have an inline, a lightweight synthetic stock gun with firesights. So I'm as messed up as anyone.